FLIR have introduced a moderate price thermal camera for boating they call the FLIR Ocean Scout TK marine thermal camera.
http://www.flir.com/marine/content/?id=73729
The MSRP is $599. A video presentation about the FLIR Ocean Scout TK appears at
https://www.youtube.com/watch?v=drKy5_Kgu3U
The FLIR Ocean Scout TK is a hand-held device with a monocular color viewfinder. The user can select from several color palettes for the image presentation which is refreshed at a 9-Hz rate.